Main structure for bridge curve data.
The member elements method, input_curve1, input_curve2 and match_point
are required for all bridge types.
The members reverse_tangents, shape_control1 and shape_control2
are required for all except UF_CURVE_inherit_shape and UF_CURVE_tangent_conic.
The member shape_control1 is used for UF_CURVES_tangent_conic.
The member stiffness_method is used for UF_CURVES_match_curvature_peak only.
The member inherit_curve is used for UF_CURVE_inherit_shape method only.
Documentation for UF_STRING_p_t and UF_STRING_t can be found in the NX Open
Reference Manual under uf_modl -> Types ->
string_list.